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Chapter 14. Motion Settings > Smoothing Motion with Spatial Interpolation

Smoothing Motion with Spatial Interpolation

Ordinarily, a clip proceeds to and from keyframes directly, in straight lines. You can smooth sharp changes in direction, rotation, and distortion by selecting one of the smooth motion options. These options cause the clip to follow a rounder, smoother course.

To choose a smooth motion option:

1.
In the Motion Settings dialog box, check the box next to the Smooth Motion pull-down menu (Figure 14.43).

Figure 14.43. Check the box next to the Smooth Motion pull-down menu to activate it.


The Smooth Motion pull-down menu becomes active.

Interpolation Options

The beauty of keyframes is that they save you work. If you set the keyframes, Premiere calculates the frames in between, a process known as interpolation. You won't find the word, "interpolation" in Premiere's documentation, but you will encounter the term in other animation programs, including Adobe's own After Effects. No harm in getting used to it now. By default, Premiere calculates the values between keyframes using a linear progression. Spatially, this linear interpolation method means that a clip proceeds from one position to the next in a straight line. Temporally, linear interpolation causes the clip to move from one position to the next at a constant rate, or speed.

As you might guess, simple linear interpolation can make motion seem somewhat mechanical. To make motion appear more natural, you would have to set many more keyframes—and in effect defeat their labor-saving purpose. Fortunately, Premiere offers a few other, more sophisticated interpolation methods. Temporally, this means motion can accelerate or decelerate from one keyframe to the next. Spatially, interpolation options allow movement to follow a smoother, rounder course through keyframe positions.


2.
From the Smooth Motion pull-down menu, choose a smoothing option (Figure 14.44):

Figure 14.44. Choose an option from the Smooth Motion pull-down menu.


Smooth Motion—for the smallest amount of smoothing.

Averaging-Low—for a moderate amount of smoothing.

Averaging-High—for a high amount of smoothing.

If the Show Paths option is checked, you can see the effects of the smooth motion option in the motion path (Figure 14.45).

Figure 14.45. If the Show Paths option is checked, you can see the effects of the smooth motion option in the motion path.



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